Argon Elemental Symbol
Argon



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Argon Argon Argo Argônio Argón Argon

Argon Bohr ModelArgon is a Block P, Group 18, Period 3 element. The number of electrons in each of Argon's shells is 2, 8, 8 and its electronic configuration is [Ne] 3s2 3p6. In its elemental form argon's CAS number is 7440-37-1. The argon atom has a covalent radius of 106±10.pm and it's Van der Waals radius is 188.pm. Air is the primary raw material used to produce argon products. Argon constitutes 1.28% by mass and 0.934% by volume of the Earth's atmosphere. Argon was discovered and first isolated by Lord Raleigh and Sir William Ramsay in 1894. Argon was the first noble gas to be discovered.

Argon is non-toxic. Argon information, including technical data, safety data and its high purity properties, research, applications and other useful facts are specified below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.


    • Properties
    • Safety Data
    • Research
    • Isotopes
    • Other Elements

    Argon Properties


    GENERAL PROPERTIES   PHYSICAL PROPERTIES  
    Symbol: Ar Melting Point: -189.36 oC, -308.848 oF, 83.79 K
    Atomic Number: 18 Boiling Point: -185.85 oC, -302.53 oF, 87.3 K
    Atomic Weight: 39.95 Density: 1656 (40 K) kg m-3
    Element Category: noble gases Liquid Density @ Melting Point: 1.40 g·cm−3
    Group, Period, Block: 18, 3, p Specific Heat: N/A
        Heat of Vaporization 6.53 kJ mol-1
    CHEMICAL STRUCTURE Heat of Fusion 1.21 kJ mol-1
    Electrons: 18 Thermal Conductivity: 17.72x10-3  W·m−1·K−1
    Protons: 18 Thermal Expansion: N/A
    Neutrons: 22 Electrical Resistivity: N/A
    Electron Configuration: [Ne]3s23p6 Electronegativity: N/A
    Atomic Radius: N/A Tensile Strength: N/A
    Covalent Radius: 106±10 pm Molar Heat Capacity: 5R/2 = 20.786 (Cp) J·mol−1·K−1
    Van der Waals radius: 188 pm Young's Modulus: N/A
    Oxidation States: 0 Shear Modulus: N/A
    Phase: Gas Bulk Modulus: N/A
    Crystal Structure: face-centered cubic Poisson Ratio: N/A
    Magnetic Ordering: diamagnetic Mohs Hardness: N/A
    1st Ionization Energy: 1520.58 kJ mol-1 Vickers Hardness: N/A
    2nd Ionization Energy: 2665.88 kJ mol-1 Brinell Hardness: N/A
    3rd Ionization Energy: 3930.84 kJ mol-1 Speed of Sound: (gas, 27 °C) 323 m·s−1
           
    IDENTIFIERS   MISCELLANEOUS  
    CAS Number: 7440-37-1 Abundance in typical human body, by weight: N/A
    ChemSpider ID: 22407 Abundance in typical human body, by atom: N/A
    PubChem CID: 23968 Abundance in universe, by weight: 200000 ppb
    MDL Number: MFCD00003431 Abundance in universe, by atom: 6000 ppb
    EC Number: 231-147-0 Discovered By: Lord Rayleigh and William Ramsay
    Beilstein Number: N/A Discovery Date: 1894
    SMILES Identifier: [Ar]  
    InChI Identifier: InChI=1S/Ar Other Names: Argo, Argônio
    InChI Key: XKRFYHLGVUSROY-UHFFFAOYSA-N  
           
           
           
           
           


    Recent Research & Development for Argon

    • Xiao Xiao, Xueming Hua, Yixiong Wu, Comparison of temperature and composition measurement by spectroscopic methods for argon–helium arc plasma, Optics & Laser Technology, Volume 66, March 2015
    • M. Popovic, M. Novakovic, M. Mitric, K. Zhang, N. Bibic, Structural, optical and electrical properties of argon implanted TiN thin films, International Journal of Refractory Metals and Hard Materials, Volume 48, January 2015
    • Mingchao Wang, Jiachen Liu, Haiyan Du, Feng Hou, Anran Guo, Yingna Zhao, Jing Zhang, A new practical inorganic phosphate adhesive applied under both air and argon atmosphere, Journal of Alloys and Compounds, Volume 617, 25 December 2014
    • T.N. Koltunowicz, P. Zhukowski, V. Bondariev, A. Saad, J.A. Fedotova, A.K. Fedotov, M. Milosavljevic, J.V. Kasiuk, Enhancement of negative capacitance effect in (CoFeZr)x(CaF2)(100-x) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere, Journal of Alloys and Compounds, Volume 615, Supplement 1, 5 December 2014
    • Qun Li, Baohe Wang, Zongchang Zhao, Molecular dynamics simulation of wetting and interfacial behaviors of argon fluid confined in smooth and groove-patterned rough nano-channels, Computational Materials Science, Volume 95, December 2014
    • Bryan G. Beutel, Natalie R. Danna, Riddhi Gangolli, Rodrigo Granato, Lakshmiprada Manne, Nick Tovar, Paulo G. Coelho, Evaluation of bone response to synthetic bone grafting material treated with argon-based atmospheric pressure plasma, Materials Science and Engineering: C, Volume 45, 1 December 2014
    • K. Khojier, H. Savaloni, S. Zolghadr, On the dependence of structural and sensing properties of sputtered MoO3 thin films on argon gas flow, Applied Surface Science, Volume 320, 30 November 2014
    • Maša Knez Hrncic, Mojca Škerget, Željko Knez, Argon as a potential processing media for natural and synthetic substances, The Journal of Supercritical Fluids, Volume 95, November 2014
    • Jie Han, Xiao-dong Wang, De-chun Ba, Coordinated analysis of multiple factors of argon blowing parameters on the effect of circulation flow rate in RH vacuum refining process, Vacuum, Volume 109, November 2014
    • S. Majee, M.F. Cerqueira, D. Tondelier, J.C. Vanel, B. Geffroy, Y. Bonnassieux, P. Alpuim, J.E. Bourée, Permeation barrier performance of Hot Wire-CVD grown silicon-nitride films treated by argon plasma, Thin Solid Films, Available online 12 October 2014

    Argon Isotopes


    Argon has three stable isotopes: 36Ar, 38Ar, and 40Ar.

    Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
    36Ar 35.967545106 Observationally Stable 0+
    38Ar 37.9627324 Stable 0+
    40Ar 39.9623831225 Stable 0+